Device fob grinding and sharpening



F. souczEK Re. 20,805 DEVICE FOR GRINDING AND SHARPENING RAZOR BLAD July19, 1938.

Original Fifled May 13, 1933 lleisaued July 19, 1938 UNITED STATESPA'rsn'r orrlcs 'zosos nevlca roa oamnmo sun snaarnnnv aazon. namesFerdinand Soucaek, Brusau, Czechoslovakia, asassignm signor, by mesnocorporated, New York, N. Y. rlginal No. 2,004,838, dated June '11, 1935,8e-

ents, to Siemens, In-

rial No. 670,980, May 13, 1933. Application for reissue March 16, 1938,SerialNo. 196,200.. In CIechoslovakia May 31, 1932 25 Claims.

The invention relates to a device for thegrinding and sharpening ofrazor blades and particularly to a device which makes it possible towork simultaneously on all four cutting surfaces of a double edged razorblade.

In known grinding devices of this type, the movement between the razorblade and the grinding agent which is necessary for the grinding isgenerally only rectilinear and of a definite 0 type of stroke,regardless of whether it is parallel, inclined or perpendicular to theedge and whether a grindstone or grinding rolls are used. However, thistype of grinding favors the production I on the sides of the edge of theblade of grooves which make it difllcult or even impossible to obtain acomplete grinding of the sides of the edge. The grinding, moreover,results in subjecting the blades to an injurious bending stress.

Grinding devices are also known wherein a circular movement relative tothe grinding members is imparted to the blade during the grinding"process. However, in this case, it is necessary either to bend thecutting edges of the blade onto the grinding surfaces oi the grindingagent by 5 means of a special tensioning device, or else mutuallyinclined grinding surfaces have to be provided and the blade circularlyreciprocated by a rocking type of movement. The first-mentioned deviceinvolves the disadvantage that the tensioning of the blade makes itdoubtful that a uniform application of the sides of the edge to thegrinding members can be obtained, while with the'second device there isno assurance that the correct grinding angle will be maintained, sincethesprings which press the blade down onto the grinding surfaces producea greater or less bending depending upon the thickness thereof.

The present invention has for its object to enable extremely flnegrinding to be obtained by .a curvilinear grinding motion between theblade and grinding means and by obviating any bending stresses on theblade, provision being made to ensure that thecutting edge is notcontacted by the grinding means in any part of the curvilinear grindingmotion in which the grinding proceeds towards the cutting'edge.

According to the invention this object is attained by so guidingspring-loaded grinding members in the longitudinal sides of a pair of socasing members detachably fitted together that a rasor blade clampedtherebetween and capable of curvilinear motion in its own plane formswith said grinding members a wedge-shaped driving means whereby thegrinding members as during each curvilinear motion of the blade not onlymove perpendicularly thereto but also execute a reciprocatory movementtransversely with respect to the cutting edges. Consequently thegrinding members are subjected to 9. raising and lowering movement aswell as to a pendulous 5 movement by the curvilinear motion of the razorblade. .Whereas the former movement facilitates the grinding of theblade, in the latter the grind-v ing angle is subjected to aperiodic'alteration and accordingly it is ensured that the grinding 10shall not proceed towards the cutting edge of the razor blade. Themagnitude of theperiodic alteration of the grinding angle is determinedby free play of the grinding members in their guides which dependsentirely on the accuracy of the 15 construction.

A constructional form of the invention is illus trated by way of examplein the accompanying drawing in which:

Figure 1 is a longitudinal section through the 20 I Figures 4 to 7 areenlarged cross-sectional views I through a grinding memberand theoperating or driving means, and show four positions of the a grindingmember relatively to the razor blade during a grinding operation,

Figures 8 and 9 are diagrams illustrating the eilect of altering thegrinding angle on the cutting edge of the blade or on the grindingopera- 40 tion.' Y

In the construction illustrated the device comprises a pair of similarcasing members i and 2 made of artificial material and grinding mem bersl which are accommodated together with 45 flat springs in longitudinalgrooves! provided atbothsidesofeachofthe members I andln The grindingmembers are in the form of blocks,alsoofartiflci'almaterialandareprovidedat their ends adjacent th'ebladewithseven teeth 0. so Grinding'means in the formal powder is pressedbetweentheteethwhicharesoarrangedthatthey mayengage withslightplayinthegapsbetween the teeth .of'the oppositely disposedgrinding members. The endsofthe grindingmembers ss gether.

adjacent the flat springs are curved and terminate in extensions 1 whichpermit the pendulous movement and also the raising and lowering of thegrinding members without axial play. A cover plate I is secured by meansof counter-sunk screws 9 on the casing and serves to limit the'twopossible movements of the grinding members inasmuch as the longitudinalslots for the passage of the grinding teeth 6 are so dimensioned thatthe shoulders 8 at both ends of each grinding member are able to bear onthe plate against the pressure of the spring and so that the slot ismade wider than the grinding teeth. Guide pins I I are riveted to thecover plate HI at the corners and are provided with collars resting onsaid cover plate. Holes I! are provided in the other cover plateopposite to the pins ll so that the casing parts I and 2 may be readilyfitted to- This construction ensures that the two casing parts may beheld closed by hand at a certain distance from one another withoutshifting so that the teeth of one grinding member may engage in the gapsbetween the teeth of another grinding member without relative contact.

Three bearing pins I3 shown in Figures 1 and 3 are embedded in thebottom of the lower half I."

of the casing. A pair of grooved rollers l5 for rotating a razor bladel4 and an intermediate grooved roller l6 are rotatably supported on thepins I 3. All the rollers are provided beneath the cover plate withtoothed wheelsll having the same number of teeth as one another. Anoperating cord l'l extending out from opposite ends of I the casing isguided around the rollers as shown in Figures 1 and 3 and effectsrotation in the same direction of carrier pins IB eccentricaily disposedon both outer rollers I5. The pins l8 are provided with hardened steelsleeves l9. Circular holes 20 in the cover plate Ill enable the pins illto project therethrough but do not permit the outer rollers to drop out.

It is of course obvious that the diameters of the carrier pins I8 andalso their distance from one another coincide with the diameters andspacing of the holes in a razor blade. On the other hand, the distancebetween the inner edge ofthe grinding teeth on one side and the outeredge of the grinding teeth on the other side must be less than the widthof the razor blade inorder to ensure that the cutting flanks of thelatter never pass out of engagement with the grinding members. v

As shown in the cross-sectional views of the drawing, the grindingmembers are inclined inwardlysuthat the grinding ter-engaging grindingteeth together form a grinding angle corresponding to the cutting angleof the razor blade.

When the razor blade is positioned on the carrier pins l8 and the deviceis closed, the blade prevents the inter-engagement of opposing grindingteeth and, under the opp site but equal spring forces constitutingthegrinding pressure, is accurately positioned centrally of the. gap formedbetween the two. halves of the casing by the collars on the guide pinsII when the grinding members on both sides are not overlapped by therazor blade to the same extent (see Figure 2).

II now-the somewhat tensioned operating card I l is pulled i'romjside'toside, or, in the case where the cord is stationary,

is reciprocated along the cord, the razor blade will execute acurvilinear movement in its own plane. Owing tothe free gap between thetwo- Surfaces of the in-- pin roller in I to move in the oppositedirection in relation to v 70 the grinding device itself edge is movedtowards the grinding angle the two grinding members are forced apartagainst the action of the springs acting upon them and when the cuttingedge recedes from the grinding angle the two grinding members are causedto approach each other under the action of their springs without ceasingto bear on the cutting flanks of the blade, the grinding teeth at thesame time engaging in one another. Inthe following the former movementis referred to as the advance while the latter is referred to as thereturn of the cutting edge.

The grinding operation according to the invention is illustrated byFigures 4 to 7. In Figure 4 the razor blade I4 has completed its returnmovement in relation to the right hand grinding member 4 which abuts theinner edge of the iongitudinal slot in the cover plate III. In thisposition the grinding tooth forms the maximum grinding angle, Figure 8,with that of the upper grinding member (not illustrated). The carrierpin I8 is in its extreme left hand position. Whereas in this positionthe right hand grinding member projects to its fullest extent from thecover plate the left hand grinding member (in relation to which theblade has just terminated its advance movement) is in its lowermostposileft hand cutting edge associated with the enlarged grinding angleand the advance movement is initiated for tiie right hand cutting edgeassociated with the reduced grinding angle.

.It will be apparent from the following that the alteration in thegrinding angle takes place im mediately after the carrier pin moves fromthe dead centre position illustrated in Figure 4 or 6. The springpressure of the razor blade imposes a resistance to the displacement ofthe cutting flank on the grinding surface of the grinding member, suchresistance being dependent upon the amount of friction. As, however,this force is very great in comparison with the force necessary foradjustment of the grinding members it follows that the grinding membermust first of all be moved into contact with the slot in the cover platebefore the grinding operation proper can commence. When this occurs, asillustrated in tinued advance of the cutting edge the grinding member isgradually forced into the casing against the pressure of the springuntil the other dead centre positio'nof the carrier pin is attained(Figure 6). Upon further rotation of the carrier either directiontheblade is made the grinding members 'andbefore the grindlng'op- 'eratloncan be recommenced the alteration of the acting on the cutting flankFigure 5, and upon con- I grinding angle must take place inq-themannerabove described (Figure'7). Whereas the right hand grinding member isnow pressed outwardly by spring pressure in the subsequent returnmovethatinthiscasethe 'curvilinearmovementtoa I i 20,805 ment of-theblade, theleft hand grinding member is forced during advance movementofthe blade into thecasing against spring .pressureuntil the positionillustrated in Figure {is attained whereupon the sequence of operationsis repeated.

It is apparent that in the advance of the cutting edge, (Figure 9) thegrinding angle .is smaller than in, the return (Figure 8), and that. inthe.

former case the grinding operation is only performed on the rear thickportion of the cutting edgeQ -whereas the cutting edge proper is onlyground in the return movement. A further very noteworthy peculiarity inthis grinding operation is the fact that the grinding pressure exertedduring the advance of the blade is greater than ing its upward anddownward movement-in the direction of the spring pressure is pressedagainst the walls of its guide so that there occurs a frictional force-which checks the aforesaid movement of the grinding member. Whereasduring the advance of the cutting'edge the grinding member is movedagainst its spring the frictional force on the walls must be overcome inaddition to such spring pressure by the cord. operating means so thatthe'grinding pressureis greater than the frictional force. On the otherhand, during the return of the cutting edge this frictional force mustbe overcome by the spring so n grinding pressure is less than suchforce.

As during the advance of they cutting edge and the application of thegreater grinding pressure only the rear thick. part of the cutting edgeis ground while. the cutting edge proper remains untouched, during thereturn of the cutting edge thecutting edge proper is acted upon and theentire grinding operation may therefore be regarded as being composed.of simultaneous preliminary grinding-and sharpeningstages. '9lllustratesthe preliminary grinding while I"ig' ure 8 illustrates thesharpeningof the blade.

-"Instead of employin 'sri ding members in block form a group ofindividual grinding teeth I specially guidedin grooves may be employed,and

.withbothformofgrindingmembersthenecessaryfree play for'their movementmay beobtainedbrtsperingthegrlndingmembersitowardsthesurfacesinsteadofbyenguides for said members. Further,instead of making theguidainclined (i. e.perpendieulartothecuttingflanksoftheblade) they may be arrangedatlfl' tothe body-of the blade ,inwhiclrcase the grinding members would beappropriately inclinedfor'the purpose'of obtain-,

ingthegrindlng angle.

It is to' be understoodthatthe hereinbefore' described means ofoparationby a cordmaybe substituted by any other suitabledeviee foreffecting curvilinear-moment ofltheraaorblade. WhatIclaimls:-' i 1. Agrinding devbejordouble-edge rasor blades grindingmeansforsimultaneously operating on the four es of'the cutting for imparting. a

edge of a hlade,.and m ,tobe around or sharpened bysaidmovementtakingplaceinaplaneparalleltothatconblades comprising grindingmeans for simultaneously operating on the four cutting edges of ablade.andmeanscomprisingapairofcranks and operating cord for acurvilinear move-- 2. A grinding device fordouble-edge 'rasor ment to ablade to beground or sharpened by said grinding means, such movementtaking place the blade. the pressure exerted during the return movement.This is because the grinding member dur- I 4. A grinding device fordouble edge razor blades, comprising four grinding members with inclinedgrinding surfaces for the simultaneous treatment of all four edgesurfaces of a blade, rotatable driving means for imparting circulargrinding movement relativetothe grinding members to a blade to be groundby the said grindingv members in the plane of the blade, and springsacting on each of the said grinding 'members in such manner-that it isconstantly urged toward the juxtaposed edge surface of the said blade.

' 5. A grinding device for double edge blades, comprising four grindingmembers for the simultaneous treatment of all four edge surfaces of ablade, rotary drive means for imparting circular grinding movementrelative to the grinding members to a blade to be ground by the saidgrinding members in the plane of the blade, and springs acting on eachone of the. said grinding members in such manner that .it is constantlyurged to-v ward the juxtaposed edge surface of the said blade, the saidgrinding members being provided with comb-like interrupted grindingsurfaces and being superposed in such manner that. at times theprojecting portions of the grinding surfaces of one grinding memberextend into the intermediate spaces of the grinding'surfaces of theopposed grinding member. Y

.6. A grinding device for'double edge razor blades, .comprising fourgrinding members with inclined grinding surfaces for the simultaneoustreatment or: all four edge surfaces of a blade,

springs independently urging each grinding member toward the juxtaposededge'surface of a blade to be ground, and a pair of crank pinsforholding the blade. said two crank pins being designed for rotating inthe same direction andimparting a bers in the plane of the blade to beground, without bending the latter. a

7. A grinding device for double edgev .razor blades comprising fourfgrinding members for the simultaneous treatment of all four edgesurfaces of a blade, springs independently urging each of v the grindingmembers toward the juxtaposed edge surface of a blade to be ground, apair of crank pins for holding the blade, said two crank pins beingdesigned for rotating in the same direction and imparting a circulargrinding movement inthe plane of the blade relative to the grindingmembers, without bending the said blade, grooved disks on the axles ofthe said crank pins, and a band extending around the said grooved disksand extending out of the housing for imparting rotary movement to'thesaid crank pins. 7

8. A grinding device for double edge razor *circular movement relativeto the grinding memblades comprising spring-pressed grinding members forthe simultaneous treatment of all four edge surfaces of a blade, androtary drive means for imparting a circular grinding movement relativeto the grinding members to the blade to be ground by the said grindingmembers,.the latter being guided in the direction transverse to thecutting edge of, the blade to be ground with so much room for play thatan oscillatory movement of the grinding members is possible in the saiddirection. I

9. A razor blade sharpener comprising abrading means providing inclinedsharpening surfaces, spaced lugs disposed centrally of said sharpeningsurfaces to hold positively a safety razor blade 'whereby the cuttingbase of the latter are placed in juxtaposition to'said sharpeningsurfaces and exerting pressure on the sides of the edges of said' ing alower member and an upper member, abrad- 70 ing means within said lowermember providing a means for imparting similar individual revolvablemovements to said lugs.

10. A razor blade sharpener comprising abrading means to providejuxtaposed and oppositely inclined sharpening surfaces, a holderincluding spaced actuating members for a razor blade to hold positivelyboth the cutting edges of said blade in contact with said sharpeningsurfaces, and

means for imparting individual revolvable movements to each of saidactuating members.

11. A razor blade sharpener comprising abrading means to providejuxtaposed and oppositely inclined sharpening surfaces, a holderincluding spaced actuated members for a razor blade to hold positivelyboth cutting edges of said blade in contact with said sharpeningsurfaces, means for imparting individual revolvable movements to each ofsaid actuating members and means for razor blade.

12. A razor blade sharpener comprising a lower member and an'uppermember, abrading members located in' said lower member and spaced fromeach other, a holder locatedintermediate said abrading members toreceive a razor blade,

means upon saidupper member so that when the latter is placed insuperposed position upon said lower member, pressure is exerted upon therazor blade and means for imparting a revolvable movement to said razorblade holder.

member and an upper member, abrading members located in saidlower'member and spaced from each other, a holder located intermediatesaid abrading members, to receive a razor blade, means upon said uppermember so that when the 'latter is placed in superposed position uponsaid lower member pressure is'exerted upon the razor blade-and means forimparting a revolvable movement to said razor blade holder, a portion ofsaid means being exterior of said lower member.

1 14. A razor blade sharpener comprising a casing having a lower memberand an upper member therefor, two spaced abrading members held in saidlower member and providing juxtaposed and oppositely inclined sharpeningsurfaces, a holder to receive a razor blade to position it centrally ofsaid sharpening surfaces, spring means secured to said upper member forexerting a pressure upon said razor blade when the upper member is inclosed position and meansfor imparting a revolvable movement to saidholder, a portion of said last namedimeans being exterior of saidcasing. 4 15. A razor sharpener comprising a-casing havsharpeningsurface, a holder to receive said razor blade whereby the cutting edgesof the latter are placed in contact with said sharpeningsurface, meanslocated within said upper member for ex- 13. A razor blade sharpener:comprising a lower;

erting a pressure on said razor blade when said uppermember is placed'in normal position and means for imparting a revolvable movement tosaid holder. 7

16. A razor blade sharpener comprising. two spaced abradingmembersproviding juxtaposed and oppositely inclined sharpening surfaces, meansfor holding a razor blade in spring pressed relation against saidsharpening surfaces andspaced actuating members acting individually forimparting a positive revolvable movement to said razor blade whereby thecutting edges thereof are brought into engagement with said sharpeningsurfaces.

1'7. A grinding device for the simultaneous sharpening of all fouredge-surfaces of a double- .edge razor blade, comprising a casing havingan upper and a lower member, two comblike interrupted grinding memberslongitudinally arranged v in each of said casing members, said grindingmembers of each casing member having oppo-- sitely and inwardly inclinedsharpening'surfaces and being disposed to be superposed to the grindingmembers of said other casing member in the closed state of said casing,spring means adapted to resiliently hold said superposed grindingmembers in a position wherein the projecting surface portions of agrinding member extend into the intermediate spaces of the superposedmemher, a holder to receive a razor blade, said holder; being disposedintermediate said grinding members, and drive means for imparting acurvilinear;

movement to said blade holder whereby said cutting edges .of said bladeare reciprocated wedgelike between said superposed grinding members,

said drive means comprising .a peripherally grooved roller disposed toactuate said holder, an

of, said lower casing member, and means for guiding said cord aroundsaid. rollerso as to peripherally engage the groove ofsaid roller.

.18. A grinding device for double-edge razor blades, comprising a'casinghaving an upper and a lower member, two spaced grinding members;

with comb-like interrupted inwardly inclined 'sharpeningsurfaceslongitudinally arranged in each of said casing members for thesimultaneous treatment of all four edge-surfaces of a blade, twolongitudinally spaced lugs disposed in said lower casing membercentrally of said'sharpening surfaces; to hold a safety azor bladewhereby thecutting edges of the latterare placed in engagement with saidsharpening. surfaces, an

operating cord extending out from opposite ends intermediateperipherally grooved roller revolv- V ably mounted in said lower memberbetween said lugs, means for'operatively connecting said in-- termediateroller with said two lugsso as to actuate said lugs by a simultaneousand similar movement having a longitudinal and a reciprocatorycomponent, an operating cord extending out from the opposite ends ofsaid lower casing member, and guide means for causing said cord whenactuated to operatively engage said roller.

19. A grinding device for double-edge. razor blades, comprising a casinghaving an upper and a lower member, grinding members in said lowermember having oppositely inclined sharpening surfaces, means for guidingsaid grinding-memebers in said lower member so as to be capable of araising and lowering and of a pendulous movement for v varying thegrinding angle, spring means for pressing said grinding I membersagainst the cutting edges of said blade, a razor blade holder disposedintermediate said grinding.

members, grinding means located in said upper member so as to exert apressure on said razor .75

' contact with said sharpening surfaces and to cause said grindingmembers to exert said pendulous movement whereby the grinding angle .isdecreased when said .blade moves toward a grinding member and increasedwhen said blade moves back.

20. A razor blade sharpener comprising a casing having a lower memberand an upper member, two spaced abrading members held within said lowermember and providing inwardly inciined sharpening surfaces,saidsharpening surfaces being comb-like interrupted and superposed in such amanner that at times the projecting.

portions or a" surface extend into theintermediate spaces of thesuperposed surface, springs for pressing said' abrading members againstthe edges of a blade to be sharpened, means for guiding said abradingmembers in said lower casing member so as to be capable of a raisingand" a lowering and "of a pendulous movement for varying the grindingangle, a movable holder to receive said razorblade whereby the cuttingedges of the latter are placed in contact with said sharpeneingsurfaces, means in said upper casing member for exerting pressure onsaid razor blade when said upper member is placed in normalposltion, andrevolvable drive means for actuatlng said movable holder, whereby theedges nally opposite-ends, two longitudinally arranged pairs of grindingmeans-having. c mb-like inter-'j for simultaneously operating on thefour sides of said blade are reciprocated over said'sharpening surfacesand said abrading members are caused to eilectsaid pendulous movement independenecy upon the direction. of said recipro catory movement. I

21. A grinding device for double-edge razor blades, comprising a body ofelongated shape having an upper and a lowermember, said lower memberhaving a hole in-each of its longitudirupted and inwardly inclinedgrinding surfaces of thecutting edgesof a blade, one of said grindingmeans of each pair-being-arranged in said uppcr member and the other insaid lower member. springs for a relative movement towards each other ofthe grinding means of each pair, a plate-fixedly mounted in said lowermemher, said plate forming a guide for the grinding means of said lowermember, said guide being designed to allow said means a pendulous aswell as I a raising and lowering movement, two longitudinally spacedlugs disposed in said lower member centrally of the grinding means ofsaid i lower vmember for engaging a blade to be sharpened, anintermediate peripherally grooved roller revolvably mounted in thecenter of said lower casing member, means for opera'tivelyconnecb.

ing said roller with said lugs, saidconn'ectlng means being designed toimpart to, said lugs a simultaneous and similar movement having alongltudinal and a reciprocatory component, an operating cord cngaglnsthe groove of said rollerand extending through said holes in. said lowercasing member, two grooved disks arranged at opposite sidesof saidroller "between said roller and said holes so as to cause said cord whenin operation to frictionally actuate said roller and said lugs, wherebythe blade placed upon said lugs is reciprocated between the grindingsurfaces againstthe action of said springs, and said means are caused toexert said pendulous movement. a

22. In a grinding device fordouble-edge razor blades, a casing havingholes inthe opposite ends thereof, longitudinally arranged and'inwardlyinclined grinding means for simultaneously operating on the four sidesof the cutting edges of a blade, in combination with mechanism forpresenting in both longitudinal and transverse directions points on eachcutting edge of the blade to different points on said grinding means,said mechanism comprising a peripherally grooved roller, an operatingcord engaging the groove of said roller and extending through said holesinthe opposite ends of said casing formanually actuating said roller,two guides for saidcord one of which is positioned between said rollerand one ,hole of the casing and the other of which is positioned-betweensaid roller and the other hole of the casing, said guidesbeing solocated with respect to said roller as to cause said cord when operatedto frictionally engage a substantial por- :tion of the periphery of.said groove, devices adapted to engage the blade and to maintain thecutting edges of said blade during the grinding movement .in parallelrelation to said .longitudi-f ndlly arranged grinding means; and meansactuatedby said roller .for operating said devices and the blade engagedthereby so as to effect said grinding movement.

23. In a grinding device ior douhler d ge razor blades, a lower and anupper member, longitudinally arranged and inwardly inclined grindingmeans secured to each of said members'ior 'si-,

multaneou'sly' operating on the four sides of the .cuttingedges of ablade, in combination with mechanism for presenting ,in bothlongitudinal and transverse directions pointson each cutting edge of theblade to different points on said grinding means, said. mechanismgrooved roller, an operatingJcord engaging the groove of said roller andpassing through theopposite endsof one of: said members for man uallyactuating-said'roller, guide means for. said cord comprising twoperipherally grooved rotatcomprising a able disks located on oppositesides of and adiacent to said roller, said' disks being so positionedwith respect to said roller as to cause-said cord when operated tofrictionallyengage a tlal portion of the periphery oi' the groove ofsaid to impart the operating movement to the blade. said devices beingadapted to maintain when .in

operation said blade longitudinally of said grinding means, and meansactuated by saidlroller for operating saiddevlces. V v 24. Ina grindingdevice for double-edge razor blades, "two pairs of longitudinallyarranged and inwardly inclined grinding 'members, one pair roller,devices for engaging the blade in order 4 adapted to simultaneouslyoperate on the two sides 01' one cutting edge of a blade and the otherpair adapted to simultaneously operate on the two sides of the othercutting edge of said blade, the said grinding members being;providedwith comb-like'interrupted grinding surfaces and each pair beingsuperimposed in such manner that the projecting portions of the grindingsur-v faces of one grinding memberoi said pair are adapted to extendintothe intermediate spaces of the grinding surfaces ofxthe opposedgrinding. member of said and spring means for effecting a relativemovement towards each other of the grinding members of each pair ofmovement, in'combination with mechanism forpresenting in bothlongitudinal and transverse directions points on each cutting edge ofthe vblade to difierent points on said grinding members} said mechanismcomprising devices adapted to engage the blade and to maintain the samelongitudinally of said grinding members, and means for actuating saiddevices and the blade engaged thereby.

thereof, two longitudinally arranged pairs of grinding means in saidcasing having inwardly.

moving a razor blade over the surfaces of said grinding members, saidmechanism including means for alternately forcing-in a reclprocatorywedge-like movement first one cutting edge of 'the blade between a pairof said grinding means between said roller and the other hole of the25.- In a grinding device for double-edge razor blades, a casing havingholes in the opposite ends casing, said guides being so positioned withrespect tosaid roller as to cause said cord to frictionally engage asubstantial portion of the periphery of said groove, and means actuatedby said roller for operating said reciproc atory means and the bladeengaged thereby.

' V FERDINAND SOUCZEK.

